So the update will be rolling out today. If you get it, please help everyone by getting the update.zip from your sd card before it installs. There are two ways of doing this and it in no way hurts your phone and you are at no risk of brick unlike what some of us have tried(Miami lol).
Method 1: When you get notification, download the update. When the phone turns off to restart and apply the update pull the battery. Pull out the sd card and mount it in your pc or even another microsd compatible phone you can mount. Then you should have an update.zip on the card.
Method 2: Download a logcat from the market. When you get notification of the update, open logcat. Let it start to download then just go into logcat and copy the download link from the log.
Then, post on here, or the irc room or PM someone and lets get this out so we can see if it helps at all with rooting. Thanks!